Need sleep....very badly

I was barely functioning yesterday, struggling to just stay awake. That was until about 9. I refused to let myself take a kip after work cause I wanted to go to bed at a reasonable hour. 9pm came, and went. 10pm came, and went. 11pm came, and went. The last time I looked at the clock was around midnight. I laid still in the pitch black for some time after that. Curses!